Ultrasound diagnostic apparatus and control method of ultrasound diagnostic apparatus

Abstract

An ultrasound diagnostic apparatus ( 1 ) includes an ultrasound probe ( 2 ); an image acquisition unit that generates an ultrasound image by performing transmission and reception of an ultrasound beam with respect to a subject using the ultrasound probe ( 2 ); and an initial condition setting unit ( 25 ) that sets a basic sound speed value for generating the ultrasound image of a breast of the subject on the basis of a ratio of mammary glands in the breast, which is calculated by analyzing a radiation image in which the breast is imaged, in which the image acquisition unit generates the ultrasound image of the breast using the basic sound speed value.

What is claimed is: 
     
       1. An ultrasound diagnostic apparatus comprising:
 an ultrasound probe; 
 a processor configured to 
 generate an ultrasound image by performing transmission and reception of an ultrasound beam with respect to a subject using the ultrasound probe, 
 acquire tomosynthesis images of a breast of the subject which are captured by performing a tomosynthesis for the breast sandwiched between a first plate and a second plate, 
 set a basic sound speed value for generating the ultrasound image of a breast of the subject based on a ratio of mammary glands in the breast, which is calculated by analyzing a radiation image in which the breast is imaged, where the ratio of the mammary glands is represented by a ratio R1 of a volume of the mammary glands in a mammary gland region with respect to a volume of the breast in the mammary gland region, and a ratio R2 of a thickness of a mammary gland layer in the mammary gland region with respect to a breast thickness in the mammary gland region calculated from the tomosynthesis images, where the breast thickness in the mammary gland region is calculated from a lower surface of the first plate and an upper surface of the second plate, 
 wherein the processor is further configured to generate the ultrasound image of the breast using the basic sound speed value. 
 
     
     
       2. The ultrasound diagnostic apparatus according to  claim 1 ,
 the processor is further configured to extract a fat layer and a mammary gland layer by analyzing the ultrasound image of the breast. 
 
     
     
       3. The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is further configured to generate the ultrasound image using the basic sound speed value for the mammary gland layer which is extracted. 
 
     
     
       4. The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is further configured to generate the ultrasound image using a fat sound speed value different from the basic sound speed value for the fat layer which is extracted. 
 
     
     
       5. The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is further configured to 
 extract a muscle layer by analyzing the ultrasound image of the breast, and 
 generate the ultrasound image using a muscle sound speed value that is different from the basic sound speed value and a fat sound speed value and is determined for muscle, for the extracted muscle layer. 
 
     
     
       6. The ultrasound diagnostic apparatus according to  claim 3 ,
 wherein the processor is further configured to 
 extract a muscle layer by analyzing the ultrasound image of the breast, and 
 generate the ultrasound image using a muscle sound speed value that is different from the basic sound speed value and a fat sound speed value and is determined for muscle, for the extracted muscle layer. 
 
     
     
       7. The ultrasound diagnostic apparatus according to  claim 4 ,
 wherein the processor is further configured to 
 extract a muscle layer by analyzing the ultrasound image of the breast, and 
 generate the ultrasound image using a muscle sound speed value that is different from the basic sound speed value and the fat sound speed value and is determined for muscle, for the extracted muscle layer. 
 
     
     
       8. The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is further configured to set the basic sound speed value using the ratio of the mammary glands input by a user. 
 
     
     
       9. The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is further configured to set the basic sound speed value using the ratio of the mammary glands input by a user. 
 
     
     
       10. The ultrasound diagnostic apparatus according to  claim 3 ,
 wherein the processor is further configured to set the basic sound speed value using the ratio of the mammary glands input via by a user. 
 
     
     
       11. The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is further configured to 
 calculate the ratio of the mammary glands by analyzing the radiation image input from an external device, and 
 set the basic sound speed value using the ratio of the mammary glands. 
 
     
     
       12. The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is further configured to 
 calculate the ratio of the mammary glands by analyzing the radiation image input from an external device, and 
 set the basic sound speed value using the ratio of the mammary glands. 
 
     
     
       13. The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the ratio of the mammary glands is a ratio of a volume of the mammary glands in a breast region with respect to a volume of the breast in the breast region. 
 
     
     
       14. The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the ratio of the mammary glands is a ratio of a volume of the mammary glands in a mammary gland region with respect to a volume of the breast in the mammary gland region. 
 
     
     
       15. The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is further configured to set a basic sound speed value V1 (m/s) by V1=(R1/R2)×V11+ (1−R1/R2)×V12 using the ratio R1(%) of the volume of the mammary glands, the ratio R2 of the thickness of the mammary gland layer, a mammary gland sound speed value V11 (m/s) determined for the mammary glands, and a fat sound speed value V12 (m/s) determined for fat. 
 
     
     
       16. A control method of an ultrasound diagnostic apparatus, the control method comprising:
 acquiring tomosynthesis images of a breast of a subject which are captured by performing a tomosynthesis for the breast sandwiched between a first plate and a second plate, 
 setting a basic sound speed value for generating an ultrasound image on the basis of a ratio of mammary glands in a breast of a subject, which is calculated by analyzing a radiation image in which the breast is imaged, where the ratio of the mammary glands is represented by a ratio R1 of a volume of the mammary glands in a mammary gland region with respect to a volume of the breast in the mammary gland region, and a ratio R2 of a thickness of a mammary gland layer in the mammary gland region with respect to a breast thickness in the mammary gland region calculated from the tomosynthesis images, where the breast thickness in the mammary gland region is calculated from a lower surface of the first plate and an upper surface of the second plate; and 
 generating the ultrasound image of the breast using the basic sound speed value.